Liewehr F R, Kulild J C, Primack P D
Endodontic Residency Program, U.S. Army Postgraduate Dental School, U.S. Army Dental Activity, Fort Gordon, GA.
J Endod. 1993 Oct;19(10):489-91. doi: 10.1016/S0099-2399(06)81488-3.
Simulated straight root canals in 30 transparent acrylic blocks were instrumented and obturated with gutta-percha without sealer using standard lateral condensation (group A). The "zap and tap" method of warm lateral condensation was then used on the same 30 canals (group B). A second treatment of warm lateral condensation was then applied to these same canals (group C). The acrylic blocks were weighed after initial canal preparation and after each subsequent obturation. A 14.63% increase in weight of the gutta-percha occurred in group B compared with group A, and a 2.43% increase in weight occurred in group C compared with group B. Both differences were statistically significant (p < 0.001).
